Vibrator for mixers



Dc. 29, 1936. A. w. RYBECK VIBRATOR FOR MIXERS Filed Aug. 15. 1931 2 Sheets-Sheet 1 g] nwnl 01 '15: W. RYBEc/r.

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Dec. 29, 1936. A. w. RYBECK 2,055,327

v VIBRATOR FOR MIXERS I Filed 'Aug. 15. 1951 2 Sheets-Sheet a .lhventar Jttomcy-s Patented Dec. 29, 1936 UNITED STATES PATENT VIBRATOR FOR MIXERS corporation Application August 15,

9 Claims.

In the concrete mixing machines in general use, it-is desirable to impart to the charging skip customarily used for charging aggregates into the mixing drum, a kind of jarring or shaking eifect in order to completely discharge the materials from the skip, so that a batch containing the proper amounts of ingredients will be obtained and also to prevent loss and wastage of materials. This shaking or jarring of the skip is resorted to when the skip is in raised position, so that all of the material in the skip will slide therefrom into the mixing drum, as will be indicated.

It is the usual practice in machines of this kind to efiect this jarring in the skip through the provision of instrumentalities mounted upon the machine designed to impart hammer-like blows to the skip, to thereby loosen the charge in the skip and to assure a complete discharge thereof into the mixing drum. The full force of the blows is received directly by the skip.

Certain objections are inherent to such provisions, among which may be mentioned the fact that such hammer-like blows do not always provide'sufficient shock to completely discharge the materials from the skip, the constructions of the devices are relatively complicated, there is excessive wear, and anobjectionable amount of noise. As distinguished from prior art constructions, the skip is not subjected to a direct jarring blow.

The present invention provides a means for rapidly vibrating the skip at high frequency when in its elevated position in a continuous manner quite distinct from the individual shocks and jars imparted thereto by, the hammer-like blows previously referred to. This high frequency vibration assures a thoroughshaking of the skip and its contents so that a complete discharge of the materials from the skip into the mixing drum will be accomplished in a simple manner, which is free from parts likely to get out of order, and which are not subject to excessive wear. Means are also provided for reducing the noise which has heretofore accompanied this jarring of the skip, which noise is at times highly objectionable.

The invention will be more readily understood by reference to the accompanying drawings, in which Figure 1 is a perspective view of a concrete mixer, the skip of which is shown in lowered position, and which has the present invention applied thereto.

Figure 2 is a fragmentary perspective view of the machine in Figure 1, looking from above, showing the skip in raisedposition, and showing also the complete means employed in accordance 1931, Serial No. 557,396

With this invention for accomplishing the vibration of the skip.

Figure 3 is an enlarged fragmentary view of the skip agitating means, and

Figure 4 is a fragmentary side elevation of the 5 spring-like member secured to the skip, as shown in Figure 1.

Referring more particularly to the drawings, and with particular reference to Figure 1, there is shown a well known form of concrete mixer, 10 in which A designates the skip employed for charging the materials into the mixing drum B, the skip A being adapted to be lifted in well known manner to effect discharge of its contents into the mixing drum B.

Secured to the skip is a spring arm I, which is mounted to the skip by means of a bracket 2, to which bracket the arm I is secured by means of a bolt 3, which may be provided with washers 4, as will be seen from Figure 4. By means of these 20 washers adjustment of the arm I may be provided.

The mixing drum B is supplied with water from the tank C, the water flowing into the drum through the pipe 5 and downwardly projecting 25 extension 6 which opens into the charging port of the mixing drum. The pipe 5 extends horizontally and is carried in a bearing member 1, which bearing member carries a bracket 8 which is provided with an extension 9 which serves as a 30 bearing member for the vibration transmitting member or shaft I0.

Secured to the shaft Ill adjacent its end nearer the skip is a bracket I I, which carries a roller I2 against which the arm I abuts when the skip A 35 is raised to its discharging position to secure the bracket II and roller I2 in proper position. The bracket 8 may be provided with an abutment member I3 which engages with the bracket II to assure a rigid support therefor and to prevent any tendency of the roller I2 to drop down away from the spring I. It will be understood that the bearing'member l for the pipe. 5 is rigidly mounted to the frame of the machine.

The end of shaft Ill adjacent the mixing drum terminates in a bearing It, there being secured to the shaft I0 adjacent the bearing I4, a bracket I5 which carries a roller 56 which engages the teeth of an actuating device for producing vibration, such as the ring gear H on the mixing drum B. This roller I6 is adapted to ride up and down along the teeth of the gear H, which action produces a rapid high frequency vibration of the shaft III, which motion is transmitted to the roller- I2, and thence to the spring arm I, and'55 through bracket 2 to the skip A, thereby producing a vigorous agitation vibration of the skip.

' It will therefore be seen that when the skip A is raised to discharging position, the spring arm I is brought into positive engagement with the vibrating roller I2 and due to the extremely rapid impulses received through the shaft I0 and roller I2 resulting from the rapid movement of the roller I6 along the gear H, the spring arm I is thrown in very energetic vibrations at very high frequency, thus producing intense high frequency vibration of the entire skip, producing a positive dislodgment of all sand or other material which might otherwise adhere to the skip.

The qualities of a spring or resilient member are well known and it needs little or no discussion to point out that by virtue of the spring member in this assembly the skip is relieved of any direct impact, and the full eifect of the blow delivered to the spring end is not received by the skip.

It will therefore be seen that the shaft I0 when taken with the rollers I2 and I6, together with the respective brackets therefor, will constitute an assembly which serves as a vibratory device for setting the vibratory member or arm I secured to the skip into high'frequency vibration for the agitation of the skip as previously described.

It will also be apparent that, since the brackets II and I5 are secured firmly to the shaft ID, if the roller I2 be made heavier than the roller I6, the roller I2 will drop by the action of gravity when the vibratory arm I is out of engagement with the roller I2. This action would cause the roller I6 to be lifted out of engagement with the gear I1 when the skip is in its loading position, so that the vibratory member I constitutes, under such circumstances, a means for bringing the aforesaid assembly constituting the vibratory device into operative and inoperative positions.

The abutment member I3 is provided to prevent the roller I2 from dropping too far, so that it will be sure to engage the vibratory member I when the skip 'A is raised.

It will be also understood that the shaft I0 is held in position at its end adjacent the drum by means of a bracket I8 suitably secured to the frame of the machine, as by bolts or rivets as indicated at I9.

By making the rollers I2 and I6 of rubber, all objectionable noise is removed, there being produced thereby only a dull rumble during the operation of the machine.

It will he therefore seen that there is provided by this construction a very simple means forditions and uses. 7

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is

1. An apparatus of the character described, comprising the combination with a concrete mixing machine having the usual charging'skip and mixing drum provided with a ring gear, of a shaft, a member engaging the shaft and adapted to engage the ring gear as the drum rotates to thereby vibrate the shaft, a second member engaging the shaft, and a vibratory arm secured to the skip and adapted to engage the said second member when the skip is in discharging position to be thereby set into vibration, thereby vibrating the skip.

2. An apparatus of the character described, comprising the combination with a concrete mix-' ing machine having the usual charging skip and mixing drum provided with a ring gear, of a shaft, a roller connected with the shaft and adapted to ride along the teeth of the ring gear as the drum rotates, to thereby vibrate the shaft, a second roller connected with the shaft, and a vibratory spring arm secured to the skip and adapted to engage the said second roller when the skip is in discharging position, to be thereby set into vibration, thereby vibrating the skip;

3. An apparatus of the character described, comprising the combination with a concrete mix-' er having the usual charging skip and mixing drum provided with a ring gear, of a vibratory device comprising an oscillatably mounted shaft,

a bracket secured to. the shaft,adjacent each end thereof, and a roller mounted on each bracket, one of the said rollers being in engagement with the gear when in operative position to ride along the gear as the drum rotates to thereby vibrate the shaft and other roller, and a vibratory spring arm secured to the skip adapted to engage the said other roller to move the shaft to position, the firstmentioned roller in engagement with the gear to thereby agitate the skip.

4. An apparatus of the character described, comprising, the combination with a concrete mixing machine having a ring gear and the usual charging and mixing devices, of a resilient vibratory member secured to the charging device, means engaging the ring gear of the mixing device and adapted to ride on the teeth of the gear as the mixing device rotates, and instrumentalities for conveying the resulting high fre-- quency vibrations from the said ring gear engaging means to the resilient vibratory member on the charging device when the charging device is in position to: discharge its contents into the mixing device, whereby the high frequency vibrations are transmitted to the charging device to vibrate the same.

5. An apparatus of the character described, comprising the combination with a concrete mixing machine having the usual charging skip and mixing drum provided with a ring gear, of aresilient vibratory arm mounted on the skip, means engaging the ring gear and adapted to be set into high frequency vibration by rotation of the drum and ring gear, the saidmeans including a, roller adapted to ride over the teeth of the gear, and instrumentalities for transmitting the resulting vibrations from the roller to the resilient arm on the skip when the skip is raised into position to discharge its contents into the mix-- ing drum to thereby rapidly vibrate the skip.

6. An apparatus of the character described comprising the combination with a concrete mixer having the usual charging and mixing instrumentalities, and a ring gear, of mechanism engageable with the ring gear and adapted to be set into high frequency vibration by rotation of the ring gear, and a resilient vibratory member on the charging instrumentalities adapted to v75 engage the said mechanism when the charging instrumentalities are in position to charge the contents thereof into the mixing instrumentalities, to thereby impart to the charging instrumentalities high frequency vibrations to agitate the charging instrumentalities to dislodge all contained material therefrom.

'7. An apparatus of the character described, comprising the combination with a concrete mixer having the usual charging and mixing instrumentalities and a ring gear, of a device engaging the gear for riding on the teeth of the gear when the mixing instrumentality is rotated, to be thereby set into high frequency vibration, a spring member on the charging instrumentality to transmit motion to the latter when it is raised to discharging position, and means for transmitting vibratory motion from the said device to the spring member as the latter is brought into engagement with the said means responsively to movement of the charging instrumentalities, the said means including an instrumentality for rendering the said device inoperative when the charging instrumentality is lowered to loading position, the said spring member constituting means for rendering the device operative incident to raising the said charging instrumentality.

8. An apparatus of the character described, comprising the combination with a concrete mixer having the usual charging skip and mixing drum provided with a ring gear, of a vibratory device comprising an oscillatably mounted shaft, a bracket secured to the shaft adjacent each end thereof, and a roller mounted on each bracket, one of the said rollers being in engagement with the gear when in operative position to ride along the gear as the drum rotates, to thereby vibrate the shaft and other roller, the latter roller being heavier than the gear engaging roller, whereby engagement between the gear and roller is broken when the skip is in non-discharging position, and a vibratory spring arm secured to the skip adapted to engage the said other roller to move the shaft to restore engagement between the gear and gear engaging roller as the skip assumes discharging position to thereby vibrate the skip.

9. Apparatus for vibrating the skip to thereby set the same into motion and dislodge particles adhering thereto, which comprises, in combination, a source of vibration, means for transmitting vibration from said source to said skip, said means including a flexible member rigidly attached at one end to the skip and having the other end free, and a part engaging with the free end of said flexible member for flexing the same and to impart vibration thereto, said apparatus being of such a nature that the vibrations received on the free end of the flexible member are cushioned in intensity when received on the skip.

ADOLPH W. RYBECK. 

